Medicine-Ball Pike

Replaces: Stability-ball pikeThe perk: It's trickier to balance on a small ball, so you'll work an even greater number of stabilizing muscles.

The move also engages your hip flexors and rectus abdominis (your six-pack muscles) more effectively. Do it: Start in a pushup position, with your feet on a medicine ball. Keeping your core tight and legs straight, raise your hips as high as you can to roll the ball toward your hands until your feet are on top of the ball. Pause, then return to start. That's one rep. Do eight to 12, then rest 45 seconds. Do a total of three sets.

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